on guard

on guard の類語

wary, on the lookout, unadventurous, noncommittal, prudent, guarded, slow to act, overlooking no possibility, leaving out nothing, all ears, custodial, gingerly, watchful, careful, upon one's guard, on your guard, on one's guard, safe, observant, mindful, heedful, hawk eyed, vigilant, keen-eyed, sharp eyed, cautious, with open eyes, on the watch, discreet, unenterprising, judicious, uncommunicative, hesitant, circumspect, canny, eagle-eyed, sharp-eyed, thorough, argus-eyed, regardful, hawk-eyed, all eyes, sleepless, lidless, pawky, politic, deliberate, tentative, open eyed, open-eyed, alert, awake, at bay, defensively

on guard の反意語

unwary, adventurous, imprudent

on guard の言い換えを探すには

on guard（）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。